Voltage detection device

Abstract

An embodiment of the present application provides a voltage detection device including a rod body, a contact, and a probe. The contact is rotatably connected to one axial end of the rod body and is used to abut against a motor shaft, and the probe is electrically connected to the contact. By rotatably connecting the contact that abuts against the motor shaft to the rod body, the contact can be rotated relative to the rod body. When the contact abuts against the rotating motor shaft, the contact can rotate relative to the rod body under the influence of the motor shaft, changing the friction between the contact and the motor shaft from sliding friction to rolling friction and significantly reducing the friction coefficient between the contact and the motor shaft, thereby reducing wear on the contact and extending the service life of the contact, and further extending the service life of the voltage detection device.

Description

Technical Field

[0001] This application belongs to the technical field of voltage inspection, and particularly relates to a voltage detection device.

Background Art

[0002] When a motor device operates normally, its motor shaft is in a high-voltage rotating state and generates a certain shaft voltage. To ensure the normal operation of the motor device, by detecting the shaft voltage state of the motor device, its safety can be monitored. For example, the shaft voltage state can effectively reflect the ground insulation situation of the motor shaft.

[0003] In the technical field of voltage inspection, a voltage detection device that comes into contact with a motor shaft in a high-voltage rotating state for a long time is likely to suffer serious wear, which affects the service life of the voltage detection device.

Summary of the Invention

Means for Solving the Problems

[0004] Embodiments of this application provide a voltage detection device that can improve the service life of the voltage detection device.

[0005] Embodiments of this application provide a voltage detection device including a rod body, a contact, and a probe. The contact is rotatably connected to one axial end of the rod body, and the contact is used to abut against the motor shaft. The probe is electrically connected to the contact.

[0006] By adopting the above structure and rotatably connecting the contact that abuts the motor shaft to the rod body, the contact can be rotated relative to the rod body. When the contact abuts the rotating motor shaft, the contact can rotate relative to the rod body due to the influence of the motor shaft, changing the friction between the contact and the motor shaft from sliding friction to rolling friction, significantly reducing the coefficient of friction between the contact and the motor shaft, thereby reducing wear on the contact, extending the service life of the contact, and further extending the service life of the voltage detection device.

[0007] In some select embodiments of the present application, the rod body has a housing cavity that penetrates the rod body along the axial direction, and at least a portion of the probe is housed in the housing cavity and in contact with the contact.

[0008] By adopting the above structure and installing a housing cavity, the structure of the rod body can be fully utilized, providing space for the installation of the probe.

[0009] In some selectable embodiments of the present application, the voltage detection device further includes a rotating shaft located within the housing cavity, the contact being rotatably connected to the rod body via the rotating shaft.

[0010] By adopting the above structure and installing a rotating shaft, relative rotation between the contact and the rod body can be facilitated.

[0011] In some select embodiments of the present application, the direction of rotation of the rotation axis is parallel to the axial direction.

[0012] By adopting the above structure and making the rotation direction of the rotating shaft parallel to the axial direction, the rotation direction of the contact can be made substantially parallel to the rotation direction of the motor shaft, making it easier for the contact to rotate using the force from the motor shaft. In some selectable embodiments of the present invention, in a plane perpendicular to the axial direction, the rod body includes a conductive layer in which the housing cavity is installed, and an insulating layer surrounding the outside of the conductive layer, and the contact is connected to the conductive layer.

[0013] By adopting the above structure and installing a conductive layer, the housing cavity can be made into a conductive environment. When the probe is detached from the contact, it is not sufficiently connected to the contact, which affects the transmission of electrical signals and thus the detection process. However, when the probe comes into contact with the conductive layer, the conductive layer establishes an electrical connection with the contact, completing the transmission of electrical signals and improving the stress resistance of the detection device.

[0014] In some selectable embodiments of the present application, the contact is a brush head structure composed of a plurality of conductive filaments.

[0015] By adopting the above structure and installing the contact in a brush head structure, on the one hand, it is possible to easily extend the probe into the interior of the contact and ensure that the probe is sufficiently connected to the contact, and on the other hand, it is possible to increase the contact area between the contact and the motor shaft and ensure a connection between the contact and the motor shaft.

[0016] In some selectable embodiments of the present application, the contact employs a conductive carbon brush.

[0017] By adopting the above structure and mounting the contacts on conductive carbon brushes, the wear resistance of the contacts can be effectively improved, and the contacts can be given a certain degree of flexibility, making it easier to bond the contacts to the motor shaft.

[0018] In some select embodiments of the present application, the probe includes a contact end extending into the contact and a connecting end extending from one end away from the contact within the housing cavity.

[0019] By adopting the above structure and installing contact terminals, the connection between the probe and the contact can be facilitated, and by installing connection terminals, the connection between the probe and an external device that processes electrical signals can be facilitated.

[0020] In some select embodiments of the present application, the probe further includes a connecting wire connected to the connection end for transmitting an electrical signal received by the contact end.

[0021] By adopting the above structure and installing connecting wires, it is possible to easily connect the probe to an external device that processes electrical signals.

[0022] In some select embodiments of the present application, the voltage detection device further includes a sealing member for sealing one end of the housing cavity away from the contact, and the connecting wire or the connecting end can extend from the sealing member out of the housing cavity.

[0023] By adopting the above structure and installing sealing members, the inside of the containment cavity can be relatively sealed, reducing the influence of the external environment on the inside of the containment cavity and improving detection accuracy.

[0024] In some select embodiments of the present application, the voltage detection device further includes a detection body for processing and / or displaying the electrical signal acquired by the contact, and the connection line is connected to the detection body.

[0025] By adopting the above structure and installing the detection unit, the detected and acquired electrical signals can be processed effectively.

[0026] In some selectable embodiments of the present application, a sealing ring is further installed on the rod body outside the insulating layer.

[0027] By adopting the above structure and installing a sealing ring, when the voltage detection device is connected to the installation position, the installation position can be sealed. When the voltage detection device is installed on the motor and the motor has an opening for passing the rod body, the sealing ring is used for the opening.

[0028] Compared with the related technology, in the voltage detection device of the embodiment of the present application, by rotatably connecting the contact abutting against the motor shaft to the rod body, the contact can be rotated relative to the rod body. When the contact abuts against the rotating motor shaft, the contact can rotate relative to the rod body under the influence of the motor shaft, changing the sliding friction between the contact and the motor shaft to rolling friction, significantly reducing the friction coefficient between the contact and the motor shaft, thereby reducing the wear on the contact, extending the service life of the contact, and further extending the service life of the voltage detection device.

[0029] Hereinafter, the features, advantages and technical effects of exemplary embodiments of the present application will be described with reference to the drawings.

Brief Description of the Drawings

[0030] [Figure 1] It is a configuration diagram of a voltage detection device provided by some embodiments of the present application. [Figure 2] It is a configuration diagram of a motor and a voltage detection device provided by some embodiments of the present application. [Figure 3] It is a configuration diagram of a rotating shaft and a contact provided by some embodiments of the present application. [Figure 4] It is a configuration diagram of a voltage detection device provided by some other embodiments of the present application. [Figure 5] It is a configuration diagram of a rotating shaft and a contact provided by some other embodiments of the present application. [Figure 6]This is a diagram of the configuration of a voltage detection device provided by some further embodiments of the present application. In the drawings, the drawings are not necessarily drawn to actual scale. [Modes for carrying out the invention]

[0031] The embodiments of this application will be described in more detail below, in conjunction with the drawings and examples. The detailed description of the embodiments and the drawings below are used to illustrate the principles of this application, but are not intended to limit the scope of this application; that is, this application is not limited to the embodiments described.

[0032] In the description of this application, unless otherwise specified, "multiple" means two or more, and the directions or positional relationships indicated by terms such as "up," "down," "left," "right," "inside," and "outside" are solely for the purpose of facilitating and simplifying the description of this application, and do not indicate or imply that the devices or elements mentioned must have a specific direction, be composed of, or be operated in a specific direction, and therefore should not be understood as limiting this application. Furthermore, terms such as "first," "second," and "third" are used solely for explanatory purposes and should not be understood as indicating or implying relative importance. "Perpendicular" does not mean perpendicular in the strict sense, but within the margin of error. "Parallel" does not mean parallel in the strict sense, but within the margin of error.

[0033] Where the “Examples” refer to in this Application, it means that certain features, structures, or characteristics described in conjunction with the Examples may be included in at least one Example of this Application. Each occurrence of the phrase in the Specification does not necessarily refer to the same Example, nor does it constitute an independent or alternative Example that contradicts the other Examples. Those skilled in the art will understand, both explicitly and implicitly, that the Examples described herein may be combined with other Examples.

[0034] The directional terms appearing in the following description all refer to the directions shown in the figures and do not limit the specific structure of the present application. In the description of the present application, and what should be explained, unless otherwise specifically defined or limited, the terms “attachment,” “connection,” and “connection” should be understood broadly to mean, for example, that connections may be fixed, detachably connected, integrally connected, directly connected, or indirectly connected via an intermediate medium. A person skilled in the art may understand the specific meaning of the above terms in the present application depending on the specific circumstances.

[0035] In the field of voltage testing technology, testing environments vary, and some environments significantly affect voltage testing operations, such as motor voltage testing. When a motor is operating normally, it generates a constant shaft voltage, and by measuring this shaft voltage, it is possible to detect insulation defects between the motor shaft and ground, thereby reducing safety risks in the motor shaft.

[0036] The inventors found that in related technologies, when testing shaft voltage, it is necessary to extract a voltage signal from the surface of a high-speed rotating motor shaft. To connect the surface of the motor shaft to an external testing device, it is usually necessary to introduce contacts and connect them to the surface of the motor shaft. However, because the contacts need to be connected to the high-speed rotating motor shaft for a long time, contact wear becomes severe, shortening the service life of the voltage detection device.

[0037] To mitigate the problem of the relatively short service life of the voltage detection device, the inventors' research has shown that by adjusting the structure of the contact, the contact can be rotatably connected to the structure that fixes the contact. When the contact comes into contact with the rotating motor shaft, the contact can rotate relative to the rod body due to the influence of the motor shaft, changing the friction between the contact and the motor shaft from sliding friction to rolling friction, significantly reducing the coefficient of friction between the contact and the motor shaft, thereby reducing wear on the contact, extending the service life of the contact, and further extending the service life of the voltage detection device.

[0038] Based on the above considerations, the inventors of this application conducted diligent research and designed a voltage detection device.

[0039] Figure 1 is a configuration diagram of a voltage detection device provided by some embodiments of the present application. As shown in Figure 1, the voltage detection device includes a rod body 1, a contact 2, and a probe 3. The contact 2 is rotatably connected to one end of the rod body 1 in the axial direction (x-axis direction in the figure), and the contact 2 is used to contact a motor shaft 10, and the probe 3 is electrically connected to the contact 2.

[0040] The rod body 1 is used to provide a support body for the voltage detection device, facilitating connection between the voltage detection device and the mounting position. For example, if the mounting position is a motor 100, the rod body 1 can be connected to the casing 101 of the motor 100.

[0041] Contact 2 is used to contact the surface of the motor shaft 10 and extract electrical signals (e.g., voltage signals) from it. Exemplary examples include contact rods, brushes, etc., made of conductive material.

[0042] Probe 3 is used to observe the electrical signal extracted from contact 2, and a differential probe 3 or the like can be used.

[0043] Figure 2 is a configuration diagram of a motor 100 and a voltage detection device provided in some embodiments of the present application. Referring to Figure 2, the motor 100 is an example, and the motor 100 includes a casing 101 and a motor shaft 10, a portion of which is installed inside the casing 101, the motor shaft 10 can rotate at high speed relative to the casing 101, and at least a portion of the rod body 1 is located inside the casing 101.

[0044] By rotatably connecting the contact 2 that abuts the motor shaft 10 to the rod body 1, the contact 2 can be rotated relative to the rod body 1. When the contact 2 abuts the rotating motor shaft 10, the contact 2 can rotate relative to the rod body 1 due to the influence of the motor shaft 10, changing the friction between the contact 2 and the motor shaft 10 from sliding friction to rolling friction, significantly reducing the coefficient of friction between the contact 2 and the motor shaft 10, thereby reducing wear on the contact 2, extending the service life of the contact 2, and further extending the service life of the voltage detection device.

[0045] Selectively, referring to Figure 2, the rod body 1 can extend from outside the casing 101 into the casing 101 and the contact 2 can be brought into contact with the motor shaft 10.

[0046] Selectively, the contact 2 and the rod body 1 can be connected via a rotating structure (e.g., a rotating shaft 4).

[0047] Selectively, the rod body 1 may be a hollow rod, and the probe 3 extends to one side of the contact 2 through the hollow structure within the rod body 1 and is connected to the contact 2 to complete the electrical connection between the probe 3 and the contact 2.

[0048] Selectively, the rod body 1 may be made of a conductive material, the contact 2 is electrically connected to the rod body 1, the rod body 1 is electrically connected to the probe 3, and a connection is further established between the contact 2 and the probe 3.

[0049] As shown in Figure 1, in some selectable embodiments of the present invention, the rod body 1 has a housing cavity 11 that penetrates the rod body 1 along the axial direction of the rod body 1 (the x-axis direction in the figure), the contact 2 is rotatably connected to one end of the rod body 1 along the axial direction, and at least a portion of the probe 3 is housed in the housing cavity 11 and in contact with the contact 2. By providing the housing cavity 11, the structure of the rod body 1 can be fully utilized and space can be provided for the installation of the probe 3.

[0050] Selectively, the probe 3 may have a rod-like structure and can extend along the axial direction within the housing cavity 11.

[0051] As shown in Figure 1, in some selectable embodiments of the present invention, the voltage detection device is installed in a housing cavity 11 and further includes a rotating shaft 4 for rotatably connecting the contact 2 to the rod body 1. The installation of the rotating shaft 4 facilitates relative rotation between the contact 2 and the rod body 1.

[0052] Selectively, contact 2 may be a ring-shaped structure, the rotation axis 4 is connected to the center of contact 2, and contact 2 can rotate around the center.

[0053] Selectively, the orientation in which the rotating shaft 4 is installed is parallel to the radial direction of the rod body 1.

[0054] Figure 3 is a configuration diagram of the rotating shaft 4 and contact 2 provided in several embodiments of the present application. As shown in Figures 1 to 3, in several selectable embodiments of the present application, the direction of rotation of the rotating shaft 4 (direction w in the figures) is parallel to the axial direction. By making the direction of rotation of the rotating shaft 4 parallel to the axial direction, the direction of rotation of the contact 2 can be made substantially parallel to the direction of rotation of the motor shaft 10, making it easier for the contact 2 to rotate using the force from the motor shaft 10.

[0055] Figure 4 is a configuration diagram of a voltage detection device provided in some other embodiments of the present application, and Figure 5 is a configuration diagram of the rotating shaft 4 and contact 2 provided in some embodiments of the present application. Referring to Figures 4 and 5, selectively, the rotation direction of the rotating shaft 4 (direction w in the figures) is perpendicular to the axial direction. By making the rotation direction of the rotating shaft 4 perpendicular to the axial direction, the contact 2 can be kept in a essentially fixed position when it rotates, reducing the space required for the rotation of the contact 2 and reducing the influence of the rotation of the contact 2 on other structures at the detection position.

[0056] Referencing Figures 4 and 5, exemplary, when the rotation direction of the rotating shaft 4 is perpendicular to the axial direction, the rotating shaft 4 includes an inner ring 41, an outer ring 42, and a ball bearing 43 installed between the inner ring 41 and the outer ring 42, wherein the inner ring 41 is rotatable relative to the outer ring 42, the inner ring 41 is connected to the contact 2, and the outer ring 42 is connected to the side wall of the housing cavity 11. By installing the inner ring 41, the outer ring 42, and the ball bearing 43, a rotatable connection between the contact 2 and the rod body 1 can be achieved.

[0057] As shown in Figures 1 and 4, in several selectable embodiments of the present invention, in a plane perpendicular to the axial direction, the rod body 1 includes a conductive layer 12 in which a housing cavity 11 is installed, and an insulating layer 13 surrounding the outside of the conductive layer 12, and the contact 2 is connected to the conductive layer 12. By installing the conductive layer 12, the housing cavity 11 can be made a conductive environment, so that when the probe 3 is detached from the contact 2, the probe 3 is not sufficiently connected to the contact 2, affecting the transmission of electrical signals and thereby affecting the detection process, and when the probe 3 then contacts the conductive layer 12, the conductive layer 12 makes an electrical connection with the contact 2, completing the transmission of electrical signals and improving the stress tolerance of the detection device.

[0058] Selectively, the conductive layer 12 can be made of copper, giving the conductive layer 12 good conductivity characteristics.

[0059] As shown in Figures 1 and 3, in some selectable embodiments of the present invention, the contact 2 is a brush head structure composed of multiple conductive filaments. By placing the contact 2 in a brush head structure, on the one hand, the extension of the probe 3 into the interior of the contact 2 is facilitated, allowing the probe 3 to be fully connected to the contact 2, and on the other hand, the contact area between the contact 2 and the motor shaft 10 is increased, ensuring a connection between the contact 2 and the motor shaft 10.

[0060] Selectively, contact 2 may have a roller brush head structure.

[0061] In some selectable embodiments of the present invention, the contact 2 employs a conductive carbon brush. By mounting the contact 2 on a conductive carbon brush, the wear resistance of the contact 2 can be effectively improved, and the contact 2 can be given a certain degree of flexibility, thereby facilitating the bonding of the contact 2 to the motor shaft 10.

[0062] Figure 6 is a configuration diagram of a voltage detection device provided in some further embodiments of the present application. As shown in Figure 6, in some selectable embodiments of the present application, the probe 3 includes a contact end 31 extending into the contact 2 and a connecting end 32 extending from one end away from the contact 2 in a housing cavity 11. The contact end 31 facilitates connection between the probe 3 and the contact 2, and the connecting end 32 facilitates connection between the probe 3 and an external device that processes electrical signals.

[0063] As shown in Figures 2 and 6, in some select embodiments of the present invention, the probe 3 further includes a connecting wire 33 connected to a connection end 32 for transmitting electrical signals received by the contact end 31. The provision of the connecting wire 33 facilitates connection between the probe 3 and an external device for processing electrical signals.

[0064] As shown in Figures 2 and 6, in some selectable embodiments of the present invention, the voltage detection device further includes a sealing member 5 for sealing one end of the housing cavity 11 away from the contact 2, and a connecting wire 33 or connecting end 32 can extend from the sealing member 5 to the outside of the housing cavity 11. By installing the sealing member 5, the inside of the housing cavity 11 can be relatively sealed, reducing the influence of the external environment on the inside of the housing cavity 11 and improving detection accuracy.

[0065] Selectively, the sealing member 5 may be a plug-shaped structure and is used to seal one end of the housing cavity 11 away from the contact 2. Exemplarily, the sealing member 5 may be an insulating material such as rubber or plastic.

[0066] As shown in Figures 2 and 6, in some selectable embodiments of the present invention, the voltage detection device further includes a detection body 6 for processing and / or displaying the electrical signal acquired by contact 2, and the connecting line 33 is connected to the detection body 6. By installing the detection body 6, the detected and acquired electrical signal can be processed effectively.

[0067] Selectively, the detection unit 6 may employ an oscilloscope.

[0068] Selectively, referring to Figure 2, and taking the detection of the motor shaft 10 as an example, the positive side of the probe 3 is connected to contact 2, and the negative side of the probe 3 is connected to the casing 101.

[0069] As shown in Figures 1 and 2, in some selectable embodiments of the present invention, the rod body 1 is further fitted with a seal ring 7 located on the outside of the insulating layer 13.

[0070] By installing the seal ring 7, the mounting position can be sealed when the voltage detection device is connected to the mounting position. If the voltage detection device is installed on the motor 100 and the motor 100 has an opening for the rod body 1 to pass through, the seal ring 7 is used for this opening.

[0071] Selectively, the seal ring 7 is installed on the outside of the casing 101 and located at the connection between the casing 101 and the rod body 1, and is used to seal the slit at the connection between the casing 101 and the rod body 1. Exemplarily, the seal ring 7 may be an oil seal ring.

[0072] In some selectable embodiments of the present application, a voltage detection device is provided comprising a rod body 1, a contact 2, and a probe 3. The contact 2 is rotatably connected to the rod body 1 and is used to contact a motor shaft 10; the probe 3 is fixed to the rod body 1 and is used to be electrically connected to the contact 2; the rod body 1 has a housing cavity 11 that penetrates the rod body 1 along its axial direction; the contact 2 is rotatably connected to one end of the rod body 1 along its axial direction; and at least a portion of the probe 3 is housed in the housing cavity 11 and in contact with the contact 2. The voltage detection device further includes a rotating shaft 4 installed in the housing cavity 11 for rotatably connecting the contact 2 to the rod body 1, the direction of rotation of the rotating shaft 4 is parallel to the axial direction. In a plane perpendicular to the axial direction, the rod body 1 includes a conductive layer 12 in which a housing cavity 11 is installed, and an insulating layer 13 surrounding the outside of the conductive layer 12, and the contact 2 is connected to the conductive layer 12. The contact 2 is a brush head structure composed of a plurality of conductive filaments. The probe 3 includes a contact end 31 extending into the interior of the contact 2, and a connecting end 32 extending from one end away from the contact 2 in the housing cavity 11. The probe 3 further includes a connecting line 33 connected to the connecting end 32 for transmitting electrical signals received by the contact end 31. The voltage detection device further includes a sealing member 5 for sealing the end of the housing cavity 11 away from the contact 2, and the connecting line 33 or the connecting end 32 may extend from the sealing member 5 outside the housing cavity 11. The voltage detection device further includes a detection body 6 for processing and / or displaying the electrical signals acquired by the contact 2, and the connecting line 33 is connected to the detection body 6. A sealing ring 7 is further installed on the rod body 1, which is located outside the insulating layer 13.

[0073] While the present application has been described with reference to preferred embodiments, various improvements can be made thereto without departing from the scope of the application, and components therein can be replaced with equivalents, and any of the technical features mentioned in each embodiment can be combined in any way, especially unless there is a structural conflict. The present application is not limited to the specific embodiments disclosed herein, but includes all technical ideas that fall within the scope of the utility model claims. [Explanation of Symbols]

[0074] 100 Motor, 10 Motor shaft, 101 Casing, 1 Rod body, 11 Housing cavity, 12 Conductive layer, 13 Insulating layer, 2 Contact, 3 Probe, 31 Contact end, 32 Connection end, 33 Connection wire, 4 Rotating shaft, 41 Inner ring, 42 Outer ring, 43 Ball bearing, 5 Seal member, 6 Detection body, 7 Seal ring

Claims

1. The rod body and A contact is rotatably connected to one end of the rod body in the axial direction and used to contact the motor shaft, The probe includes, which is electrically connected to the contact and used to observe the electrical signal drawn from the contact, The rod body has a housing cavity that penetrates the rod body along the axial direction, and at least a portion of the probe is housed in the housing cavity and in contact with the contact. In a plane perpendicular to the axial direction, the rod body includes a conductive layer in which the housing cavity is installed, the contact is connected to the conductive layer, and when the probe is disengaged from the contact, it electrically contacts the conductive layer. Voltage detection device.

2. The voltage detection device further includes a rotating shaft installed within the housing cavity, and the contact is rotatably connected to the rod body via the rotating shaft. The voltage detection device according to claim 1.

3. The direction of rotation of the aforementioned rotating shaft is parallel to the axial direction. The voltage detection device according to claim 2.

4. In a plane perpendicular to the axial direction, the rod body further includes an insulating layer that surrounds the outside of the conductive layer and insulates the conductive layer from the outside. The voltage detection device according to claim 2 or 3.

5. The aforementioned contact is a brush head structure composed of multiple conductive filaments. The voltage detection device according to claim 1.

6. The aforementioned contact employs a conductive carbon brush. The voltage detection device according to claim 5.

7. The probe includes a contact end extending into the contact and a connecting end extending from one end away from the contact within the housing cavity. The voltage detection device according to claim 1.

8. The probe further includes a connecting line connected to the connection end for transmitting electrical signals received by the contact end. The voltage detection device according to claim 7.

9. The voltage detection device further includes a sealing member for sealing one end of the housing cavity away from the contact, and the connecting wire or the connecting end can extend from the sealing member out of the housing cavity. The voltage detection device according to claim 8.

10. The voltage detection device further includes a detection unit for processing and / or displaying the electrical signal acquired by the contact, and the connecting line is connected to the detection unit. The voltage detection device according to claim 9.

11. A sealing ring is further installed on the rod body, which is located outside the insulating layer. The voltage detection device according to claim 4.

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